About this tool
Real-world CSV exports are rarely clean — extra whitespace around values, blank rows left over from spreadsheet editing, duplicate records from repeated exports, inconsistent header casing, and mixed delimiters (commas vs. semicolons vs. tabs) are all common. This tool takes a messy CSV and fixes those issues in one pass: it trims leading and trailing whitespace from every cell, strips fully empty rows, removes exact duplicate rows, normalizes header names to a consistent format, and auto-detects the delimiter your file actually uses instead of assuming a comma. The cleaned result can be copied or downloaded immediately. Everything runs client-side in your browser, so CSV exports containing customer data, financial records, or anything else sensitive never leave your machine.
Frequently asked questions
Does it detect the delimiter automatically?
Yes — the tool inspects the first several rows and picks the most consistent delimiter (comma, semicolon, or tab) rather than assuming comma-separated values.
Will it change my actual data values?
No — cleaning only removes whitespace, empty rows, exact duplicates, and normalizes headers. Your real data values are preserved.
Can it handle CSVs with quoted fields containing commas?
Yes, quoted fields (e.g. "Smith, John") are parsed correctly and the commas inside quotes are not treated as delimiters.
What counts as a duplicate row?
A row is considered a duplicate only if every column matches exactly against a previous row — partial matches are left alone.
Is there a file size limit?
There's no hard limit we impose, but since everything processes in your browser's memory, very large files (hundreds of MB) may be slow depending on your device.